Originally Posted by paul323
As has been pointed out by others, and worth reiterating: Consider how you will use the boat.
If you want to race, and have the money, get a folding prop as discussed. No-brainer.
If you are cruising/weekend sailing, consider a fixed prop - for a boat your size, a 3-blade. Fixed props are significantly cheaper (there is a big used market), easier to maintain, less likely to go wrong if you are miles offshore. Arguably more robust. Arguably better for reversing - although much depends on the folder brand.
Folding/feathering props are more expensive, benefit from maintenance (e.g. annual removal, cleaning, reassembly), more likely to go wrong - BUT you'll probably get 0.5knot more speed, and they tend to be quieter (although fixed props people often leave the engine in reverse - no noise, more drag).
Very well put. I agree totally with what paul has said. I would also like to mention that many are very happy with the "low drag fixed 3 blade prop" made by Campbell. Practical sailor has surely done a review somewhere as well. If I had extra money, this is what I would get as I prize reliability over drag, but would like to reduce drag.
West by North Enterprises - Campbell Sailer
If you like folders there is a fairly inexpensive folder on the market with replacable carbon fiber blades called the kiwiprop.
Kiwiprop Home of the Kiwi feathering prop